RECON: TNO occultation with 525595

Event between (525595) 05JP179 and star GA0720:05546749 with event index number of 1594057

Geocentric closest approach at 2023/04/12 17:30:23 UTC

J2000 position of star is 15:30:16.6 -16:48:21
Equinox of date position of star is 15:31:29.7 -16:52:42
Stellar brightness G=16.4, use SENSEUP=128 with the MallinCam and and exposure time of 2 seconds with the QHY174 camera.
Star is 50 degrees from the moon. Moon is 58% illuminated.
TNO apparent brightness V=23.0

TNO is 42.6 AU from the Sun and 41.7 AU from the Earth.
The TNO is moving 20.3 km/sec on the sky relative to the star, or, 2.4 arcsec/hr.
The 1-sigma error in the time of the event is 248 seconds.
The 1-sigma cross-track error in the shadow position is 2057 km.

The TNO has an absolute magnitude Hv=6.7
Diameter=275.4 km assuming a 5% albedo -- 13.6 sec chord
Diameter=112.4 km assuming a 30% albedo -- 5.5 sec chord
Dynamical classification is CLASSICAL
 
 
 
 
 
 
 
 

Star training set for 525595, (2023/04/12 17:27UT)
Object            RA         Dec     mag  sep  mel
Antares        16:30:50.3 -26:28:54  0.9 16.75  34
27Bet Lib      15:18:15.8 -09:28:03  2.6  8.09  56
34Zet3Lib      15:31:59.4 -16:41:16  5.6  0.22  50
PPM 230359     15:32:58.3 -17:06:04  8.1  0.39  50
PPM 230330     15:31:34.0 -16:50:15  9.9  0.05  50
525595         15:31:35.7 -16:53:04 16.4        50
Positions are for equinox of date

Azimuth is measured in degrees eastward from north. North is at an azimuth of 0, due East is at an azimuth of 90 degrees, due South is 180, and due West is 270.

Do not use the listing below for the RECON CPC 1100 telescopes. This is provided for other non-team facilities.

Star training set for 525595, (2023/04/12 17:27UT)
Object            RA         Dec     mag  sep  mel
Antares        16:29:24.4 -26:25:56  0.9 16.75  34
27Bet Lib      15:17:00.3 -09:22:59  2.6  8.09  56
34Zet3Lib      15:30:40.4 -16:36:34  5.6  0.22  50
PPM 230359     15:31:39.1 -17:01:24  8.1  0.39  50
PPM 230330     15:30:14.9 -16:45:32  9.9  0.05  50
525595         15:30:16.6 -16:48:21 16.4        50
Positions are for J2000

Event circumstances last updated at 2021/07/06 02:47:48 UT

Marc W. Buie, Southwest Research Institute

RECON